AD8278BRZ-RL Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The AD8278BRZ-RL is a low-power, wide-supply-range difference amplifier from Analog Devices with selectable gains of ½ and 2, featuring 86 dB minimum CMRR and 550 kHz bandwidth in an 8-pin SOIC package. Optimized for industrial signal conditioning and battery monitoring requiring accurate differential measurements at low cost.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- AD8278BRZ-RL Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of AD8278BRZ-RL?
- Selectable gains of ½ and 2 V/V with matched integrated resistors
- 86 dB minimum common-mode rejection ratio (CMRR) across supply range
- 550 kHz -3 dB bandwidth for moderate-speed differential signal capture
- Wide supply range: ±2.25 V to ±18 V or single 4.5 V to 36 V
- Low input offset voltage of 200 µV maximum for accurate DC measurements
- Low quiescent current for power-sensitive portable instruments
- 8-pin SOIC tape-and-reel packaging for automated assembly
- No external resistors needed — gain set by internal precision divider
What is AD8278BRZ-RL used for?
The AD8278BRZ-RL is ideal for battery cell voltage monitoring, motor current sensing, and industrial process control applications where differential signals riding on large common-mode voltages must be accurately measured at low system cost. Its selectable ½ and 2 V/V gain options enable it to scale bridge sensor outputs or attenuate high-swing differential signals to fit within the ADC input range without additional signal conditioning. Medical device designers and telecom equipment manufacturers also use the AD8278 to reject ground-loop-induced common-mode interference on long sensor cables while maintaining 86 dB CMRR.
What are the specifications of AD8278BRZ-RL?
| Pbfree Code | No |
| Manufacturer Package Code | R-8 |
| YTEOL | 0 |
| Amplifier Type | INSTRUMENTATION AMPLIFIER |
| Bandwidth (3dB)-Nom | 0.55MHz |
| Common-mode Reject Ratio-Min | 86dB |
| Input Offset Voltage-Max | 200 µV |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Non-linearity-Max | 0.0012% |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Qualification Status | Not Qualified |
| Slew Rate-Nom | 1.4V/us |
| Supply Current-Max | 0.25mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Where can I find the AD8278BRZ-RL datasheet?
AD8278BRZ-RL Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for AD8278BRZ-RL?
Compatible alternatives and drop-in replacements for AD8278BRZ-RL:
Instrumentation Amplifier, 1 Func, 200uV Offset-Max, 0.55MHz Band Width, PDSO8
Instrumentation Amplifier, 1 Func, 200uV Offset-Max, 0.55MHz Band Width, PDSO8
Frequently Asked Questions
How does the AD8278BRZ-RL achieve selectable gains of ½ and 2 without external resistors?
The AD8278BRZ-RL integrates precision laser-trimmed resistor networks internally that fix the gain at either ½ or 2 V/V depending on pin configuration, eliminating the need for external 0.1% resistors and their associated PCB area. This internal matching maintains the 86 dB CMRR without the risk of resistor mismatch degradation that occurs with discrete implementations.
What common-mode voltage can the AD8278BRZ-RL reject and how does this help in battery monitoring?
With an 86 dB minimum CMRR, the AD8278BRZ-RL attenuates common-mode signals by over 60,000:1, allowing it to accurately measure small differential voltages across a shunt resistor even when the cell stack is floating at tens of volts above ground. In a 48 V Li-ion pack with 100 mV differential cells, this level of rejection ensures less than 2 µV of common-mode error at the ADC input.
What bandwidth limitation should engineers consider when using the AD8278BRZ-RL for AC current sensing?
The AD8278BRZ-RL has a -3 dB bandwidth of 550 kHz, which is sufficient for AC current sensing at fundamental frequencies up to about 100 kHz with adequate phase margin. For switching power supplies operating above 200 kHz or motor drives with high dV/dt, the reduced gain at higher frequencies should be verified against the minimum acceptable signal-to-noise ratio at the ADC sampling rate.
How does the AD8278BRZ-RL compare to the AD8276 for a motor current sense circuit requiring attenuation?
The AD8278BRZ-RL is specifically designed for applications needing a gain of ½ to attenuate large differential shunt voltages before an ADC, whereas the AD8276 provides a fixed unity gain. In a motor drive where a 1 Ω shunt produces up to 4 V differential at peak current, the AD8278 halves this to 2 V to match a 3.3 V ADC reference without an additional op-amp stage.
What supply voltage range does the AD8278BRZ-RL support and which industrial supply rails are directly compatible?
The AD8278BRZ-RL operates from ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply, directly compatible with standard ±5 V, ±12 V, and ±15 V industrial analog rails as well as 5 V and 24 V single-supply automation systems. This broad range avoids the need for a dedicated supply conversion stage in most industrial signal chain designs.
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Why Buy from FindMyChip
About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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